9x+4y+z=10.(1)
-9x+2y+3z=-6.(2)
3x-4y+2z=5.(3)
(1)+(2):6y+4z=4.(4)
(3)*3+(2):-10y+9z=9.(5)
(4)*5+(5)*3:20z+27z=47
z=1
代入(4)
6y+4=4
y=0
代入(1)
9x+0+1=10
x=1
所以x=1 y=0 z=1
9x+4y+z=10.(1)
-9x+2y+3z=-6.(2)
3x-4y+2z=5.(3)
(1)+(2):6y+4z=4.(4)
(3)*3+(2):-10y+9z=9.(5)
(4)*5+(5)*3:20z+27z=47
z=1
代入(4)
6y+4=4
y=0
代入(1)
9x+0+1=10
x=1
所以x=1 y=0 z=1